Update README.md

Author: ilyabo

README.md

@@ -25,3 +25,6 @@ You can install the package from GitHub as follows:
     flows <- read.csv('https://gist.githubusercontent.com/ilyabo/a7b9701424257146b571149d92a14926/raw/2e9e1e9bcf64cf0090781b451037229ccb78e1b1/flows.csv')
     mapboxAccessToken <- 'YOUR_MAPBOX_ACCESS_TOKEN'
     flowmapblue(locations, flows, mapboxAccessToken, clustering=TRUE, darkMode=TRUE, animation=FALSE)
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+Here is a [nice tutorial](https://www.paulamoraga.com/blog/2020/07/11/2020-07-11-mobility/) by Paula Moraga.